Weird - I recall the cams in the K04 cars to be the same - and different to those in a K03s car. I can and will check though to make sure I am not losing my marbles! I also specifically remember speaking to Kev and him saying that it was the cams that made the difference.
Do you have any reference points for VXR's/ST's on JKM's rollers or your car on other rollers?
They might be the same, there are a few debates going on over the net regarding differences within the 2.0T. Some say the Cupra and ED30 are the same engine as the S3 and others say it's not that the S3 is a lot stronger and with tighter tolerances with the pistons etc.. All i know is i have KO3 cams and it can keep up with a manual KO$ stage 2+ and give same results on the same dyno.